This to me is the classic Caramilk wrapper. Maybe it's when I started to pay attention in the late 80's.
And the whole advertising campaign they had with the Caramilk secret, even in the seventies and using the Mona Lisa and her smile....all of it quite brilliant. I love how the 'wave' graphic starts to change through the years and also you get to see the Cadbury logo change. As a personal note, I do not like the foil wrappers that are used now as they are so much harder to open without tearing.